A:AnswerYes, I believe so, as long as the unit has a cradle that is equipped with the standard Garmin ball mount socket. There is enough rise in the mount arm to lift the device well above the mount base.
A:AnswerThe unit is very stable even over rough terrain. The base occasionally gets dirty if you don't place it on a clean surface. But that can be corrected with a little liquid soap, water, and a lint free drying towel.
A:AnswerI cannot say for sure, but it looks like it should work. The cradle that holds the 350na should snap onto the ball arm of the friction mount.
The friction mount works nicely with my Nuvi 2797 (which is larger than the 350na).